How to Convert Miles to Kilometers
Last updated 2026-09-12
Miles and kilometers are the two most common distance units worldwide — converting between them matters for travel, running, and driving directions.
Multiply by the conversion factor
1 mile equals exactly 1.60934 kilometers. Multiply your mile value by 1.60934 to get kilometers.
Reverse the conversion
To go from kilometers to miles, divide by 1.60934 (or multiply by approximately 0.621371).
Use a mental-math shortcut
For a rough estimate, multiply miles by 1.6, or use the Fibonacci trick: consecutive Fibonacci numbers approximate the conversion (5 miles ≈ 8 km, 8 miles ≈ 13 km).
Example
A 26.2-mile marathon is 26.2 × 1.60934 = 42.16 km.
Important Considerations
- Road signs and speed limits switch units at national borders — most of the world uses kilometers, while the US, UK, and a few others use miles.
- Running and cycling apps often let you toggle units — make sure you're comparing paces in the same unit before drawing conclusions.
- The conversion factor is exact by international agreement (1 mile = 1.609344 km), so precision loss only comes from rounding.
Frequently Asked Questions
- Is 1 mile exactly 1.6 km?
- It's a close approximation — 1 mile is precisely 1.60934 km. The 1.6 shortcut is accurate enough for casual estimates but compounds error over long distances.
- Why does the UK use miles for roads but kilometers elsewhere?
- The UK retained miles for road distances and speed limits by convention even after adopting the metric system for most other measurements — a historical holdover rather than a technical reason.